There are a million different things you can do. I like hindu squats and hindu push ups, back bridging, table makers etc. I also like to lift and swim, or do different type of sprint workouts, kettlebells. I just change it up. Working on my cardio has been very helpful for me. I have terrible asthma so I need all the help I can get. Cardio is huge! The biggest reason for strength training, in my opinion, is it helps prevent injuries. I think everyone should resistance train, jiu jitsu or no.